The United States, Britain and France say they believe Iran seeks a nuclear bomb capability. Iran, which is under several rounds of UN sanctions over its uranium enrichment, denies the charge.

European foreign policy chief Catherine Ashton - negotiating for the United States, Russia, Britain, France, Germany and China - is to meet with Iranian negotiators in Geneva next Tuesday.

Western diplomats say this will be a first chance to test Iran's intentions. Rouhani said he wanted a deal within a year. U.S. President Barack Obama has insisted though that Iran must follow up with concrete actions.

According to the Wall Street Journal, Iran has prepared a set of proposals that it will take to a meeting in Geneva next week as its bargaining chip to see crippling sanctions lifted from the country.

As an opening position in negotiations with the P5+1 group, the newspaper has said Tehran will offer to stop enriching uranium to levels of 20% purity, a level considered closeto that needed to make nuclear weapons.